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Mohandas, T.
- Weldability Aspects of Ferritic Stainless Steels
Authors
1 Defence Metallurgical Research Laboratory, Hyderabad, IN
Source
Indian Welding Journal, Vol 27, No 2 (1994), Pagination: 7-15Abstract
Ferritic stainless steels have recently drawn greater attention owing to their lower costs and better resistance to stress corrosion cracking than austenitic stainless steels. Although these properties make the alloy commercially attractive they still exhibit several significant draw backs that limit their use Ferritic stainless steels are less weldable than austenitic ones. A pronounced grain growth takes place in the heat affected zone and carbide precipitation occur at the grain boundaries. This makes the weld more brittle and decreases its corrosion resistance Furthermore cracks can occur in the weld metal when it cools down.
When welding stainless steels care must be taken that welding process does not affect either the corrosion resistance of the weldment or its mechanical properties. This article covers what effects the welding process can have on the metallurgy of ferritic stainless steels, selection of consumable and suggests practical advice on how potential problems can overcome
- Effect of Weld Parameters on Residual Stress Distribution in Flux Cored Arc Welding of High Strength Low Alloy Steel
Authors
1 Defence Metallurgical Research Laboratory, Hyderabad, IN
Source
Indian Welding Journal, Vol 27, No 2 (1994), Pagination: 25-30Abstract
Various types of high strength steels are increasingly used for producing welded structures with reduced weight and improved performance. Welding problems related to residual stress and distortion can arise, since yield stress of these steels are high, there is always a possibility of producing very high residual stresses in some locations near the weld. In general residual stresses become dangerous if they lead to local multi axiallity of tension stresses, which favour brittle fracture, knowledge of the residual- stress distribution in welds is necessary in order to assess the risk of crack growth in service The distribution of residual stresses after welding depends strongly on the weld parameters Attempts were made to study the influence of weld parameters (arc voltage, travel speed, welding current) on residual stresses pattern of high strength low alloy steel weldments This study was mainly performed by using X-ray stress analyzer.- Solidification Cracking Studies on Steels
Authors
1 Defence Metallurgical Research Laboratory, Hyderabad - 500058, IN
Source
Indian Welding Journal, Vol 34, No 3 (2001), Pagination: 13-19Abstract
Three steels namely, Cr-Mo steel equivalent to 4130, modified 4340 steel Containing higher silicon and high nickel whose strength is equivalent to maraging steel 250 and a maraging steel have been studied for their solidification cracking behaviour during continuous current gas tungsten arc welding employing varestraint test system. The Cr-Mo steel was also subjected to pulse mode of gas tungsten arc welding to understand the influence of current pulsing on solidification cracking behaviour. Cr-Mo steel exhibited least solidification cracking tendency while modified 4340 steel (silicon steel) showed marginally higher cracking tendency than the maraging steel. Cr-Mo steel exhibited a greater tendency to cracking in pulsed mode of welding than in conventional welding. The observed cracking tendency of cracking in pulsed mode of welding is explained on the basis of possible differences in the weld thermal history between conventional welds and pulsed welds.